The Iwata Medea crown cap A-ECL can be used to replace the needle cap for a smooth painting experience. You can use this airbrush crown cap for fine detail work. This needle cap is short in length, letting you create intricate details while protecting the needle. It also decreases paint build-up on the needle and in the nozzle cap, thereby preventing spitting. This stainless steel Iwata crown cap is compatible with Iwata HP BCS, HP BS, HP CS, and HP SBS airbrushes.